とう
ゆ
None
If there's a tsunami it's easy to get hot water. Just stick your hand out the window as the tsunami goes by and poof! That water's HOT.
As the hot water comes, you just lift up the bottom of the yurt (ゆ) you live in, and it comes flowing in. All of the cups, pots, and barrels you laid on your floor are now full of hot water.